New package: mingw64-x86_64 cross toolchain

[JonY]

The mingw64-x86_64 cross toolchain set has been uploaded to the Cygwin 
mirrors. It is used to build 64bit Windows applications and programs.

As with all software releases, it may contain bugs, please report bugs 
to <mingw-w64-public [at] lists.sourceforge.net>.

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